PR24042, Global-buffer-overflow problem in output_rel_find

PR24042, Global-buffer-overflow problem in output_rel_find

place_orphan handled ELF SHT_REL/SHT_RELA specially, output_rel_find
didn't.  This mismatch was a bug and also meant it was possible to
craft an object where ld accessed section->name out of bounds.

	PR 24042
	* emultempl/elf32.em (output_rel_find): Drop "sec" param.  Add
	"rela".
	(gld${EMULATION_NAME}_place_orphan): Use sh_type to calculate
	"rela" param of output_rel_find when ELF.  Tidy uses of elfinput.